There are people who claim to be able to eat certain types of food only but can be taught to change that. (religion.blogs.cnn.com)
This is a very broad category of problems that is characterized by a failure in the digestion and / or absorption of certain types of foods based on their nutrient composition. (mypetneedsthat.com)
You were never meant to avoid certain types of foods. (eatstopeat.com)